Measurement & Safety
Michelson interferometer
Coherence Length Measurement
Assess temporal coherence by splitting the laser into two arms and observing fringe contrast as the optical path difference changes. Available configurations cover 200-1100 nm and nominal maximum test lengths of 2 m or 50 m.
How the measurement works
Recombine the two arms of a Michelson interferometer and track fringe visibility against optical path difference. The listing uses a contrast criterion above 50% to describe the coherence measurement.
Features
- Michelson two-arm interferometry
- Fringe-contrast observation
- Alternative wavelength and path-length configurations available
Applications
- Temporal-coherence measurements
- Comparison of single- and multi-longitudinal-mode sources
- Interferometry experiments
Technical specifications
Published specifications
| Parameter | Specification |
|---|---|
| Wavelength range | 200-1100 nm; other wavelengths by configuration |
| Test precision (listed) | 1 mm |
| Maximum test length | 2 m or 50 m configurations; other lengths by agreement |
| Measurement criterion | Fringe contrast above 50% as stated in the listing |
Configure your measurement
Include these details with your enquiry so we can match the instrument and accessories.
- Laser wavelength, power and expected coherence length
- Required optical-path-difference range
- Fringe detection method and contrast criterion